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Is iterating ConcurrentHashMap values thread safe?
...nsertions or removals that occurred since the iterator was constructed. No table-wide locking is needed (or even possible) to provide thread-safety when iterating the collection. ConcurrentHashMap may be used as a replacement for synchronizedMap or Hashtable in any application that does not rely on ...
How to use XPath contains() here?
...
Paste my contains example here:
//table[contains(@class, "EC_result")]/tbody
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What is the meaning of the prefix N in T-SQL statements and when should I use it?
...t T-SQL queries. Many people have used N before inserting the value in a table.
4 Answers
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Passing arguments forward to another javascript function
...lready supports spread operator is FF at the moment. See the compatibility table for a complete, up to date data: kangax.github.io/compat-table/es6/#spread_%28...%29_operator
– TMG
Aug 13 '15 at 8:37
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Cast Object to Generic Type for returning
...n
2: astore_1
3: aconst_null
4: areturn
Exception table:
from to target type
0 1 2 Class java/lang/ClassCastException
public static void main(java.lang.String[]);
Code:
0: ldc2_w #3 // double 345435.34d
...
Unable to set data attribute using jQuery Data() API
...y="vader"></div>
<a href="#" id="changeData"></a>
<table id="log">
<tr><th>Setter</th><th>Getter</th><th>Result of calling getter</th><th>Notes</th></tr>
</table>
JavaScript (jQuery 1.6.2+)
var $chang...
Object-orientation in C
...ual functions), you use function pointers, and optionally function pointer tables, also known as virtual tables or vtables:
struct base;
struct base_vtable
{
void (*dance)(struct base *);
void (*jump)(struct base *, int how_high);
};
struct base
{
struct base_vtable *vtable;
/* bas...
Does MySQL foreign_key_checks affect the entire database?
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Let's say you have a table with referencing id's, but some referenced records are missing. If you add the foreign key (FK) while FOREIGN_KEY_CHECKS are ON, then Mysql will raise an error and refuse to add the FK, because of the broken reference. ...
how to convert a string to date in mysql?
...d, you can do
SELECT STR_TO_DATE(yourdatefield, '%m/%d/%Y')
FROM yourtable
You can also handle these date strings in WHERE clauses. For example
SELECT whatever
FROM yourtable
WHERE STR_TO_DATE(yourdatefield, '%m/%d/%Y') > CURDATE() - INTERVAL 7 DAY
You can handle all kinds of date/t...
What exactly are DLL files, and how do they work?
...Dynamic Link Libraries (DLL)s are like EXEs but they are not directly executable. They are similar to .so files in Linux/Unix. That is to say, DLLs are MS's implementation of shared libraries.
DLLs are so much like an EXE that the file format itself is the same. Both EXE and DLLs are based on ...